Results 1 to 10 of about 264,482 (211)

Swimmer with submerged SiO2/Al/LiNbO3 surface acoustic wave propulsion system

Biomimetic Intelligence and Robotics
Acoustic propulsion system presents a novel underwater propulsion approach in small scale swimmer. This study introduces a submerged surface acoustic wave (SAW) propulsion system based on the SiO2/Al/LiNbO 3 structure.
Deqing Kong, Ryo Tanimura, Fang Wang, Kailiang Zhang, Minoru Kuribayashi Kurosawa, Manabu Aoyagi   +5 more
doaj   +3 more sources

Research on Oil–Gas Two-Phase Flow Characteristics and Improvement of Aero-Engine Bearing Chamber

Lubricants, 2023
In order to study the oil–gas two-phase flow characteristics of an aero-engine bearing chamber and improve the scavenge effect of lubricating oil, the two-phase flow solution model of a bearing chamber based on the Euler–Euler method was established ...
Guozhe Ren, Yanpeng Li, Huan Zhao, Yang Yan, Wenfeng Xu, Dan Sun   +5 more
doaj   +1 more source

An Integrated Transformer Design With a Center-Core Air-Gap for DAB Converters

IEEE Access, 2021
In this paper, an integrated transformer design methodology for dual-active-bridge (DAB) converters, which basically utilize leakage inductance so as to substitute a cumbersome inductor in the conventional DAB converters, is newly proposed.
Eun S. Lee, Jin H. Park, Myung Y. Kim, Seung H. Han   +3 more
doaj   +1 more source

Fault Dynamic Modeling and Characteristic Parameter Simulation of Rolling Bearing with Inner Ring Local Defects

Shock and Vibration, 2021
To further study the fault mechanism and fault features of rolling bearings, a two-DOF rolling bearing fault dynamic model with inner ring local defects considering the bearing radial clearance and time-varying displacement excitation is established ...
Zhang Fengling, Zhang Yuwei, Guan Jiaoyue, Tian Jing, Wang Yingjie   +4 more
doaj   +1 more source

Research on reliability of pulsed electrothermal propulsion system of nanosatellite [PDF]

Омский научный вестник: Серия "Авиационно-ракетное и энергетическое машиностроение", 2021
In the paper have been discussed nanosetellite propulsion system normalization actual themes, as well their acknowledgement by the testing results. To secure needed survival probability P≥0,995, the propulsion system bottlenecks normalized values are ...
V. N. Blinov, V. V. Kositsin, A. I. Lukyanchik, P. V. Stepen, P. S. Yachmenev   +4 more
doaj   +1 more source

Optimal transformer design of DAB converters in solid‐state transformers for maximum power efficiency

IET Power Electronics, 2023
Solid‐state transformers (SST) are a viable solution to replace the conventional low‐frequency transformer in railway vehicles. In the SST, high frequency transformers in dual‐active‐bridge (DAB) converters are essentially used for electrical insulation.
Eun S. Lee, Seung H. Song, Jin H. Park, Myung R. Kim   +3 more
doaj   +1 more source

Parameter Identification Method for a Periodic Time-Varying System Using a Block-Pulse Function

Aerospace, 2022
For periodic time-varying systems, a method of parameter identification based on the block-pulse function is presented. Firstly, the state-space equation of the system was expanded using the block-pulse function, then the recursion formula of the ...
Zhi Wang, Jun Wang, Jing Tian, Yu Liu
doaj   +1 more source

A Step-by-Step Equivalent Microprediction Method for the Mechanical Properties of Composite Solid Propellants considering Dewetting Damage

International Journal of Aerospace Engineering, 2022
Reliable prediction of the macromechanical properties of composite solid propellants in the microscale can accelerate the development of propellants with high mechanical properties.
Huiru Cui, Xuan Lv, Yurong Xu, Zhiwen Zhong, Zixiang Zhou, Weili Ma   +5 more
doaj   +1 more source

Experimental and Numerical Analysis of the Progressive Damage and Failure of SiC_f/TC₄ Composite Shafts

Applied Sciences, 2023
Long fibre-reinforced metal matrix composite materials, which are widely used in industry, have complex and diverse damage modes due to their structural characteristics.
Li Luo, Jingxuan Wang, Yundong Sha, Yanping Hao, Fengtong Zhao   +4 more
doaj   +1 more source

Amazonian terrestrial water balance inferred from satellite-observed water vapor isotopes

Nature Communications, 2022
The evolution of the Amazon forest is tightly coupled to its terrestrial water balance. Here, the authors show that forest biomass changes in the Amazon are a driver of the spatiotemporal variation of evapotranspiration, and such changes could have a ...
Mingjie Shi, John R. Worden, Adriana Bailey, David Noone, Camille Risi, Rong Fu, Sarah Worden, Robert Herman, Vivienne Payne, Thomas Pagano, Kevin Bowman, A. Anthony Bloom, Sassan Saatchi, Junjie Liu, Joshua B. Fisher   +14 more
doaj   +1 more source